| /* |
| * Copyright (c) 2017, Microchip Technology Inc. |
| * Author: Tudor Ambarus <tudor.ambarus@microchip.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along with |
| * this program. If not, see <http://www.gnu.org/licenses/>. |
| * |
| */ |
| |
| #ifndef __ATMEL_ECC_H__ |
| #define __ATMEL_ECC_H__ |
| |
| #define ATMEL_ECC_PRIORITY 300 |
| |
| #define COMMAND 0x03 /* packet function */ |
| #define SLEEP_TOKEN 0x01 |
| #define WAKE_TOKEN_MAX_SIZE 8 |
| |
| /* Definitions of Data and Command sizes */ |
| #define WORD_ADDR_SIZE 1 |
| #define COUNT_SIZE 1 |
| #define CRC_SIZE 2 |
| #define CMD_OVERHEAD_SIZE (COUNT_SIZE + CRC_SIZE) |
| |
| /* size in bytes of the n prime */ |
| #define ATMEL_ECC_NIST_P256_N_SIZE 32 |
| #define ATMEL_ECC_PUBKEY_SIZE (2 * ATMEL_ECC_NIST_P256_N_SIZE) |
| |
| #define STATUS_RSP_SIZE 4 |
| #define ECDH_RSP_SIZE (32 + CMD_OVERHEAD_SIZE) |
| #define GENKEY_RSP_SIZE (ATMEL_ECC_PUBKEY_SIZE + \ |
| CMD_OVERHEAD_SIZE) |
| #define READ_RSP_SIZE (4 + CMD_OVERHEAD_SIZE) |
| #define MAX_RSP_SIZE GENKEY_RSP_SIZE |
| |
| /** |
| * atmel_ecc_cmd - structure used for communicating with the device. |
| * @word_addr: indicates the function of the packet sent to the device. This |
| * byte should have a value of COMMAND for normal operation. |
| * @count : number of bytes to be transferred to (or from) the device. |
| * @opcode : the command code. |
| * @param1 : the first parameter; always present. |
| * @param2 : the second parameter; always present. |
| * @data : optional remaining input data. Includes a 2-byte CRC. |
| * @rxsize : size of the data received from i2c client. |
| * @msecs : command execution time in milliseconds |
| */ |
| struct atmel_ecc_cmd { |
| u8 word_addr; |
| u8 count; |
| u8 opcode; |
| u8 param1; |
| u16 param2; |
| u8 data[MAX_RSP_SIZE]; |
| u8 msecs; |
| u16 rxsize; |
| } __packed; |
| |
| /* Status/Error codes */ |
| #define STATUS_SIZE 0x04 |
| #define STATUS_NOERR 0x00 |
| #define STATUS_WAKE_SUCCESSFUL 0x11 |
| |
| static const struct { |
| u8 value; |
| const char *error_text; |
| } error_list[] = { |
| { 0x01, "CheckMac or Verify miscompare" }, |
| { 0x03, "Parse Error" }, |
| { 0x05, "ECC Fault" }, |
| { 0x0F, "Execution Error" }, |
| { 0xEE, "Watchdog about to expire" }, |
| { 0xFF, "CRC or other communication error" }, |
| }; |
| |
| /* Definitions for eeprom organization */ |
| #define CONFIG_ZONE 0 |
| |
| /* Definitions for Indexes common to all commands */ |
| #define RSP_DATA_IDX 1 /* buffer index of data in response */ |
| #define DATA_SLOT_2 2 /* used for ECDH private key */ |
| |
| /* Definitions for the device lock state */ |
| #define DEVICE_LOCK_ADDR 0x15 |
| #define LOCK_VALUE_IDX (RSP_DATA_IDX + 2) |
| #define LOCK_CONFIG_IDX (RSP_DATA_IDX + 3) |
| |
| /* |
| * Wake High delay to data communication (microseconds). SDA should be stable |
| * high for this entire duration. |
| */ |
| #define TWHI_MIN 1500 |
| #define TWHI_MAX 1550 |
| |
| /* Wake Low duration */ |
| #define TWLO_USEC 60 |
| |
| /* Command execution time (milliseconds) */ |
| #define MAX_EXEC_TIME_ECDH 58 |
| #define MAX_EXEC_TIME_GENKEY 115 |
| #define MAX_EXEC_TIME_READ 1 |
| |
| /* Command opcode */ |
| #define OPCODE_ECDH 0x43 |
| #define OPCODE_GENKEY 0x40 |
| #define OPCODE_READ 0x02 |
| |
| /* Definitions for the READ Command */ |
| #define READ_COUNT 7 |
| |
| /* Definitions for the GenKey Command */ |
| #define GENKEY_COUNT 7 |
| #define GENKEY_MODE_PRIVATE 0x04 |
| |
| /* Definitions for the ECDH Command */ |
| #define ECDH_COUNT 71 |
| #define ECDH_PREFIX_MODE 0x00 |
| |
| #endif /* __ATMEL_ECC_H__ */ |